Buying OB and initial deployment

[Grumbler]

Ok, you motivated me to go digging thru the book pile.

front line 30%
second line 20%
3rd line 10%
scouts 5%
flankers 5%
reserve 20%
ambushers 5%
Command security 5% ( this last is a greek word that doesn't translate very well. Or so I have been told. (ece'o^pol) Bodguards? Sworn men? SS? Storm Troopers?

This actually works out pretty well if you consider things from a mission oriented POV. If you have 10,000 points then you want 3,000 worth in the front line. It can be Infantry, Armor, cooks and bakers, whatever the terrain and your plan call for.
Translated into modern terms, the flankers and scouts are considered the same mission, sort of. If they are out looking for contact, they are scouts. If they are in a hide watching to make sure nobody sneaks up on them, they are flankers.
These percetages are some what blurry when used with modern units. Just where the front line stops and the 3nd line begins is a matter of taste. The basic concept is to give depth to your force structure. If you look at it as one thick line then 60% of your forces are in it.